Clean backups older than retention time

Command can use default retention time or the one passed as argument.

proxmox/backup.pve.content.sh

@@ -1,7 +1,10 @@
 #!/bin/sh
 
 # This script will backup /etc/pve content :
-#   1. Make a tar to /etc/proxmox.pve/backup/
+#   1. Make an archive to a first directory (default: /etc/proxmox.pve/backup/).
+#   2. Hard link a fix archive name (pve.latest.tar.gz) to new archive
+#      Easy to monitor (this path can be expected).
+#   3. Clean backups older than retention time (default: 7).
 
 # This script can be call by a cronjob (eg. daily).
 
@@ -14,6 +17,7 @@ readonly NBARGS="${#}"
 
 readonly DEFAULT_LOCAL_BKP_DIR="/etc/proxmox.pve/backup"
 readonly TODAY_VAR=$(date +%Y%m%d)
+readonly DEFAULT_RETENTION_TIME="7"
 
 ## Colors
 readonly PURPLE='\033[1;35m'
@@ -25,7 +29,7 @@ readonly COLOR_DEBUG="${PURPLE}"
 usage() {                                                       # {{{
 
 	cat <<- EOF
-usage: $PROGNAME [-d|-h|-l]
+usage: $PROGNAME [-d|-h|-l|-r]
 
 Backup /etc/pve content
 
@@ -33,6 +37,12 @@ EXAMPLES :
     - Backup /etc/pve content to ${DEFAULT_LOCAL_BKP_DIR} directory
         ${PROGNAME}
 
+    - Backup /etc/pve content to /var/backups/pve directory
+        ${PROGNAME} --local /var/backups/pve
+
+    - Backup to default path and keep backups for 14 days
+        ${PROGNAME} --retention 14
+
 OPTIONS :
     -d,--debug
         Enable debug messages.
@@ -44,6 +54,10 @@ OPTIONS :
         Path to a local directory to store backup and override
         default path (${DEFAULT_LOCAL_BKP_DIR}).
 
+    -r,--retention,--retention-time
+        Backups older than retention time (default: ${DEFAULT_RETENTION_TIME})
+        will be delete.
+
 	EOF
 
 }
@@ -66,6 +80,12 @@ define_vars() {                                                 # {{{
 		local_bkp_dir="${DEFAULT_LOCAL_BKP_DIR}"
 	fi
 	## }}}
+	## If retention_time wasn't defined  {{{
+	if [ -z "${retention_time}" ]; then
+		## Use default retention time to clean backups
+		retention_time="${DEFAULT_RETENTION_TIME}"
+	fi
+	## }}}
 
 }
 # }}}
@@ -125,6 +145,11 @@ main() {                                                        # {{{
 	chown -R backup:adm -- "${local_bkp_dir}" \
 		&& chmod 'u+rwX,g+rX,o-rwx' -R -- "${local_bkp_dir}"
 	## }}}
+	## Clean files older than $retention_time {{{
+	### OR exit with error code 4 if it fails
+	find "${local_bkp_dir}" -maxdepth 1 -type f -mtime +"${retention_time}" -iname "pve.*.tar.gz" -delete \
+		|| exit 4
+	## }}}
 
 }
 # }}}
@@ -165,6 +190,12 @@ if [ ! "${NBARGS}" -eq "0" ]; then
 			## Define local_bkp_dir
 			local_bkp_dir="${1}"
 			;;
+		-r|--retention,--retention-time )     ## clean backups older than retention time
+			## Move to the next argument
+			shift
+			## Define retention_time
+			retention_time="${1}"
+			;;
 		* )                                   ## unknow option
 			printf '%b\n' "${RED}Invalid option: ${1}${RESET}"
 			printf '%b\n' "---"